rare and dangerous look inside a have been killed in syria's civil war. The war threatens to open a pandora's box of conflict from neighboring israel, to lebanon and turkey and iraq. Terry moran has been able to reach damascus, where some of the intense fighting is happening right now. Reporter: By day, this ancient city almost looks normal. But it's not. We've heard artillery fire all day long. And these shops are empty. There's no tourism. International sanctions are strangling businesses. And there is no end to this war in sight. Josh? Terry, thank you. And he'll be taking an inside look at the battle for damascus and what it means for u.S. International security tonight on "world news" and "nightline."

This transcript has been automatically generated and may not be 100% accurate.

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